package com.flyu.filter;

import com.flyu.pojo.User;
import com.flyu.util.Constants;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class SysFilter implements Filter {
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        // 过滤器，从Session中获取用户
        User user = (User) request.getSession().getAttribute(Constants.USER_SESSION);
        if (user==null){
            // 如果已被移除或退出
            response.sendRedirect(request.getContextPath()+"/error.jsp");
        }else {
            filterChain.doFilter(servletRequest, servletResponse);
        }

    }

    public void destroy() {

    }
}
